Figure 3 in The Roman snail (Gastropoda: Helicidae) is not a generalist herbivore, but shows food preferences for Urtica dioica and plant litter

Figure 3. Relationship between the average width (a and c) and height (b and d) of Helix pomatia shells per subpopulation independent of the sample date (), and for individual sample dates (●), and the average proportion of individuals feeding on (a, b) Urtica dioica, or (c, d) plant litter.